JOHANNA BRONK wants to make communal vegetarian meals and keep chickens. Mariel Berger hopes for social, artistic and political collaborations. Harmony Hazard is into hula hooping, book groups and anarchism.

Oh, to be a young city-dweller in search of a house share. Finding a roommate has never been easy, but for some, the endeavor has lately assumed all the urgency, emotion and extreme specificity of shopping for a life partner.

Last month, just in time for leases to turn over, the housing portion of Craigslist, the uber-community bulletin board and road map to the 20-something’s psyche, featured dozens of impassioned tone poems, vivid personal biographies and ideological wish lists.

Unfettered by space restrictions — since Craigslist is free and space on the Internet is boundless, the word count of housing posts can stretch into the thousands, and some do — and schooled in a culture of idealism that’s uniquely 21st century, those in search of shared housing and compatible mates are crafting come-ons that are as far removed from, say, “female nonsmoker wanted” as a business card is from a doctoral thesis.

Consider the efforts of Ms. Berger, 28, and Ms. Hazard, 24, who advertised eloquently for roommates before even settling on a house: “Some of the things we like are: permaculture, living sustainably, gardening, dancing, hula hooping, yoga, herbalism, making music, active listening, non-violent communication ...” they wrote, in part.

The idea, they said last week, was that the relationships would be more important than the real estate. What they hoped to put together was a kind of family, but without sibling rivalry or parents, of course; the thought was that everyone would do the dishes without grumbling.

“It’s hard to feel supported in a place like New York City, especially without a partner, or consistent person or group that you are able to connect with daily,” said Ms. Berger, a musician and piano teacher who has been renting a room from another young woman in an apartment in Park Slope. “And I’d rather have a lot of people to share my day with.”

The impetus for the group home or collective they hope to form is less about finances — though it is true that pooling resources yields better real estate — and more about community building. Indeed, Ms. Berger and others seem to share the ideals of the old-fashioned communes of yore, except that their groups are tiny, urban-centric and linked to outside interests like fixing bikes or, here in New York City, membership in the Park Slope food co-op. And like communes, many collectives give themselves names: The House of Tiny Egos (a name that’s decidedly more evocative than, say, Findhorn, that of the hoary Scottish commune) is a five-person collective in a century-old brick bungalow in Bed-Stuy. Not only do they aim to remain of the world, they hope for a convenient location, one that’s near all the major subway stops.

Are their numbers surging? Hard to tell, though people who study more traditional “intentional communities” — that is, any group of individuals living together with shared values, as in a commune or collective — say that they are demonstrably on the rise. Laird Schaub, executive secretary of the Fellowship for Intentional Community, said his nonprofit’s database has swelled from 614 communities in 2005 to more than 1,300 this year.

Traffic to the site is up 25 percent in the last year, Mr. Schaub continued, to an average of 2,000 visits a day. As to why that should be so, Mr. Schaub pointed to what he called “an ever-increasing level of dissatisfaction with traditional lifestyle choices, because there’s too much alienation and lack of connectedness. Humans are inherently social animals, yet we don’t particularly know how to get along with one another.”

The urge to create a group house or join an intentional community, he said, “is an attempt to address that.”

Ms. Berger met Ms. Hazard, who had been living in the East Village in her mother’s town house and looking for work in “social justice,” she said, at a permaculture conference in Vermont last summer. Permaculture is big with the collective-living crowd; it’s a model for sustainable living that extrapolates principles from natural ecologies — like how different plants grow together for their mutual benefit — and applies them to other systems like, well, group housing. Ms. Berger and Ms. Hazard had had collective living experiences before, in upstate New York and Oregon, and they connected over what they had learned there, as well as over the creeping dread both were feeling about returning home to New York City.

Energetic, cheerful and outgoing, they seemed very nicely matched, in this reporter’s opinion anyway, and a pretty terrific catch for just about anyone. But early last week, they still had no firm prospects and, more important, no house. The two were barely sleeping, they said; the reporter fretted over them.

Meanwhile, in Philadelphia, a similar scenario was being enacted. There, three roommates already had their house, a funky Victorian in the Cedar Park neighborhood, but needed five more.

Their advertisement on Craigslist ran to two pages when printed out and contained all sorts of buzz words that had been chosen, said its authors, reached by phone last week, to winnow out those looking for a mere room — or “dudes looking for cheap housing,” as Emili Feigelson, 19, put it. But many had to be explained to this reporter, who was puzzled by certain phrases.

“You will probably not feel at home here unless anti-ableism, anti-ageism, anti-classism, anti-racism, consent, trans-positivity and queer-positivity, etc., are very important to you,” the ad read.

Photo

HOME WORK Members of a fledgling collective get to know each other in their new house in Brooklyn. Credit
Michael Nagle for The New York Times

Anti-ableism?

Ms. Feigelson, who works as a political organizer and volunteer, explained: “It means against the oppression of those who are physically or mentally disabled, and extends to language. Like you wouldn’t use the word ‘lame.’ ”

O.K., then. Ms. Feigelson was at home with some of her housemates, including Robin Markle, 23, who works at a community college teaching seniors computer skills, and Gauge, 30, who is transitioning from he to she and works in an S&M store, and also declined to give a last name. (“My family has no idea where I am — or if I’m even alive — and I’d like to keep it that way,” she said.) They were passing the phone around the afternoon before the G20 meeting in Pittsburgh, where a few of them were planning a trip, intending to protest, Ms. Markle said.

Ms. Feigelson explained that they were being “super-selective,” because an activist house, which is what she hopes theirs will be, she said, “can create tension.”

But were their hopes too high? Their criteria too stringent?

Helen Fisher, a biological anthropologist at Rutgers University and a relationship expert (she is the scientific adviser to Chemistry.com, a spinoff of the dating site Match.com), took a gander at a few of the ads, including the ones written by Ms. Berger and Ms. Hazard and the gang in Philadelphia.

The idealized, small-scale communities they described reminded her of the hunting and gathering bands of pre-history. So she was a bit concerned that their creators didn’t seem to be searching for individuals with different skill sets. Dr. Fisher, whose new book, “Why Him? Why Her?” explores the neurochemistry of gender differences, concluded that the ad writers were by and large “estrogen-expressives, or what I call Negotiators,” which she defined as “compassionate, verbal and emotive,” as well as “Explorers, meaning those expressive of the dopamine system, or people who are energetic, creative, politically liberal.”

She also noted that they all seemed to crave roommates who shared their values, which, she pointed out, “is how many relationships are built — it’s probably the right the thing to do. You don’t want to come home and spend your evening fighting with someone over health care. You want someone who agrees with you.”

Yet she worried that other personality types, the sort who know how to fix the toaster or program the VCR, weren’t being invited into these houses.

A call to an established collective seemed in order. What is the secret to success? Is it a big compost pile? A brightly colored chore wheel? Is it possible to find domestic harmony, even domestic bliss, with four, five or ten strangers?

Suzi Teo, a former fashion designer who started the House of Tiny Egos two years ago, avers that hers is a happy home. While Ms. Teo, 44, touts the “diversity and individual skill sets” of her housemates in a way that would make Dr. Fisher proud, it all seems to circle around the dishes, just as it does in more conventional households.

“It took a whole year,” she said. “But we figured it out. There’s always one non-dishwasher, you can count on it.”

Ms. Teo’s solution? “She” — the non-washer — “pays for all the housecleaning supplies, and there is world peace,” Ms. Teo said. “Also, she has lots of connections and she gets us into clubs where we get drinks for free.”

A week and a half ago, Ms. Hazard and Ms. Berger were still searching for roommates, and also for a house. They had put a deposit on one, but it was quickly returned, as their incomes didn’t qualify them for the rent (a relief, since they hadn’t been truly keen on the house). Then they considered another, which was big and beautiful and came with the all-important garden, but they eventually retreated from it because it was in a dodgy neighborhood. (Monday of last week, Ms. Berger woke up at 4 a.m. and began researching murder rates in the area. “There were 16 in the last year,” she said glumly.)

But a happy ending was in the offing. A few weeks earlier, she and Ms. Hazard had met Johanna Bronk, 23, a recent Oberlin graduate and classical singer, and Sara Teitelbaum, who is also 23 and studying to be a lactation consultant. The two had written their own evocative ad but, like Ms. Berger and Ms. Hazard, had not found the real estate.

At that first meeting, all had taken to each other, but Ms. Hazard and Ms. Berger assumed that the four could never be a good match. Ms. Bronk, you see, envisioned a substance-free, vegetarian home, while Ms. Hazard likes a glass of wine when she hula hoops, and Ms. Berger prefers a bit of meat in her diet.

But late last week, the four joined forces, along with Rupert Poole, 30, a horticulturalist Ms. Berger met last summer. As it turned out, Ms. Berger said, “everyone was willing to compromise on their original intention because we shared a vision for a house.”

Yesterday, the five plus one more, an artist’s assistant and friend of a friend of Ms. Berger’s, signed a lease on a spic-and-span house with a stupendous backyard in the Prospect-Lefferts Gardens section of Brooklyn.

“The core of what we wanted was the same,” Ms. Berger said happily. “The fact that we wanted to live together kind of trumped all the other stuff.”

The house, however, comes with a basement apartment that still needs to be rented. Any takers?

A version of this article appears in print on October 1, 2009, on Page D1 of the National edition with the headline: A Modern Answer To the Commune. Order Reprints|Today's Paper|Subscribe